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The sine of $4$ equals
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$\int-0.756802x^3\cos\left(4x\right)dx$
Learn how to solve integral calculus problems step by step online. Find the integral int(cos(4x)sin(4)x^3)dx. The sine of 4 equals . We can solve the integral \int-0.756802x^3\cos\left(4x\right)dx by applying integration by parts method to calculate the integral of the product of two functions, using the following formula. First, identify u and calculate du. Now, identify dv and calculate v.